Britain's Amir Khan was left stunned as Danny Garcia claimed victory in their unification bout in Las Vegas on Saturday night.

Garcia now holds the WBC, WBA and Ring Magazine light-welterweight belts following the win, which he recorded courtesy of some heavy left hooks in the third and fourth rounds.

However, Khan clearly dominated the early rounds. The Brit appeared too slick for his opponent in the opening exchanges, as he landed quick combinations to surge to a 20-18 lead.

It seemed to be more of the same in the third round when Khan opened up a cut above Garcia's right eye. The American was then warned over two low blows as he struggled to land any punches of significance on Khan.

The fight turned dramatically late in the third, though, when Garcia connected with a powerful hook to send Khan crashing to the canvas. A wobbly Khan returned to his feet and ref Kenny Bayliss allowed the fight to continue with just 14 seconds of the round remaining.

The knockdown saw Garcia's confidence lift in the fourth round as Khan failed to protect his chin. A glancing blow from Garcia was all that was needed to floor Khan once again, with Bayliss having no option but to stop the fight.

Khan, who appeared shocked in his corner following the defeat, said: "I went in there with my hands held low a bit and I paid the price.

"Danny Garcia put on a great performance. That's boxing for you. One shot can change everything. My mind was clear - and I was surprised the ref stopped it. I must have taken some big shots earlier."

The win was arguably the most significant of Garcia's career, while Khan will now consider a move up to the welterweight division.